Set up blender for printing/rendering to A4, A3, A2, A1, A0 paper sizes
http://www.papersizes.org/a-paper-sizes.htm

Simple math:

1.) Get paper size from link above... e.g. A4 = 8.27" x 11.7"

2.) Multiply the dimensions by 300... e.g. A4 = 2481 x 3510

3.) Plug values into the Properties >> Dimensions >> Resolution and set scale to 100%



NOTE: You will need a printer that is capable of edge to edge printing.